I'm really surprised by how many collections are about the Zombies mode in Call of Duty. Regardless, here's mine, although I probably won't add much to it, but you never know. I'd still recommend other collections as this one is just for personal use.

This is a Collection of Maps/Campaings That I have found...
A note that this is quite a big pack of maps and the download is atleast 5Gb If you intend to download the entire pack...
However It has ALOT of maps... Which is something I couldnt seem to fi

Gilboron's Mod Collection

Collection by Gilboron

These are the mods I use. Or something.
The items in this collection are only mods uploaded to the Steam Workshop that I use unedited! I also use these following mods:
Weapon mods, with sounds removed:
- ACOG LAM M249 (http://www.l4dmaps.com/details.p

HD/Realism and GFX Major Overhaul (REPLACES EVERYTHING)

Collection by TinySquishy

This Collection includes all add-ons that are Conflict-Free (some appears to conflicts but confirmed still works together) with each other with High Definition, RNG add-ons, Graphics Over-haul add-ons, replacements for characters, weapons, special zombies

Ultimate Realistic Pack - [ThePedro004 version]

Collection by ＲｅｆｌｅＸ レ反射

This is my version of Ultimate Realistic Pack,enjoy!
Updated 23/05/14
Check my friend´s version :
http://steamcommunity.com/sharedfiles/filedetails/?id=261254438

L4D Touhou Collection

Collection by Tracewyvern

toehoes

Zetnus's Survivor Mods

Collection by Zetnus

All the survivor mods I've published or helped in the production of.
In alaphabetical order.

𝓘 ℒ𝓸𝓿𝒆 𝓪𝓷𝓭 ℒ𝓸𝓿𝒆 𝓶𝔂 𝓦𝓞ℛ𝓚𝓢ℋ𝓞𝓟 ♡

Collection by ᠌

I played Left 4 Dead 2 almost all my life and I have seen many things in it, some of them I like some of them, but in the end I just came to bring a big surprise on my part I hope you enjoy it.
HERE I GIVE YOU ALL MY COLLECTION OF MODS FOR LEFT 4

懶人一套

Collection by Molo

替換了大部分的
基本不會再更新了
所有MOD並沒有一個衝突

Christmas Time in L4D2

Collection by Thomas Jefferson

Just a collection of Christmas themed mods for the holidays.

Hotline Miami 2 Soundtrack Attack Music Replacement

Collection by your partner at science

Choose your favorites in case you don't want to download all of them at the same time :)

Left 4 Dead 2 Reborn

Collection by MarurabaATX

A Collection of Vast Improvements to L4D2 while trying to maintain the L4D feel. intended for singleplayer use but can most likely be used in local games as i have with my roommates a few times with only a few crashes :( but singleplayer is best for this.